Thermostat



(No Model.)

w. P. SINGER.

THBRMOSTAT.

Patented Apr. 8, 1890.

INVENTOR UNITED STATES PATENT OFFICE.

WILLIAM F. SINGER, or CARTHAGE, ASSIGNoE or ONE-HALF TO GILBERT L. HAVILAND, or SYRACUSE, NEW YORK.

TH ERMOSTAT.

SPECIFICATION forming part of Letters Patent No. 425,089, dated April 8, 1890.

Application filed December 19, 1889. Serial No. 384,279. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM F. SINGER, a citizen of the United States, residing at Oarthage, in the county of Jefferson and State of New York, have invented certain new and usefullmprovements in Thermostats; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to certain new and useful improven'lents in thermostats, and it more particularly relates to that class of thermostats which are used in connection with automatic fire-alarm systems, and serve when actuated by a change of temperature of the apartment in which the instrument is placed to automatically open and close the circuit and thus transmit an alarm.

To these ends, and to such others as theinvention may pertain, the same consists in the peculiar combinations, and in the novel arrangement, construction, and adaptation of parts, all as more fullyhereinafterdescribed, shown in the accompanying drawings, and then specifically defined in the appended claims.

The invention is clearly illustrated in the accompanying drawings, which, with the letters of reference marked thereon, form apart of this specification, like letters of reference indicating like parts throughout the several views, and in which drawings- Figure 1 is a perspective view of a thermostat constructed in accordance with my invention, the same being shown as attached to the ceiling and in readiness for actual use. Fig. 2 is a central vertical section of the same.

Reference now being had to the details of the drawings by letter, A designates an annular plate of sheet metal, the periphery of which is provided with a downwardly-extended flange A, and at its center the plate is provided with a screw A which is securely soldered to the upper face of the plate. This screw is adapted to enter the ceilin g and serves to secure the plate thereto, as shown in Fig. 2 of the drawings.

13 is an annular rim of metal forming the body of the thermostat. This rim is secured to the flange A upon the plate A in any suitable manner. The lower edge of the rim B is bent so as to form the vertical portion 15' and the horizontal portion B C is an annular casting, preferably of brass. This casting may be of any suitable form of design; but it has been my practice to construct it in the form of an inverted cone, havin g its outer face corrugated or otherwise ornamented. The periphery of the casting C is fitted within the angle B at the lower edge of.

the rim B, and is secured in place by fusible solder.

D D are hard-rubber plugs, which are secured within openings formed for their reception in the upper face of the casting C, and within these plugs are secured the screws D which screws are passed vertically through the horizontal extensions D at the lower ends of the arms E and E F is a bar of hard rubber, which extends transversely across the upper portion of the interior of the body B of the thermostat, and is secured in place by means of screws F passed through the bar and tapped into the metallic lugs F which are provided as sup ports for the bar.

G and G2 are bars of brass, which are secured to the upper face of the hard-rubber bar F, and through suitable openings formed in said bars are passed the vertical screws H and H the lower ends of which screws bear against the platinum-coated ends E of the spring-arms E.

I is a vertical post, which is secured at its base to the center of the upper face of the casting O, and is extended vertically through an opening formed for its passage in the hardrubber bar F. The upper end of the bar I is provided with a disk I of brass, which disk when in its normal position, as shown in Fig. 2 of the drawings, is slightly above the upper face of the plates G and G L and M are wires running to the positive and negative poles of the battery, respectively, the ends of the wires being attached to the plates G and G as shown, and N is a wire connecting the screws D as shown.

In operation, supposing that the heat within the apartment is raised to a temperature above the melting-point of the fusible solder which secures the casting G in place, the said solder is melted and the casting allowed to drop away from its seat, and the disk 1 attached to the upper end of the central post I, is brought into contact with the upper face of the brass bars G and G thus reclosing the circuit through the medium of the said bars, the circuit having been formerly maintained through the base 0, and the wire N connecting the screws D and D In order to prevent the too sudden closing of the circuit by the dropping of the disk I I solder the casting O at points upon opposite sides of the casting, a greater amount of solder being used upon one side than upon the other. So one side of the disk,leaving the seat before the other, opens the circuit at one of the points E before reforming the circuit through the disk I and bars G and G Having thus described my invention, what I claim to be new, and desire to secure by Letters Patent, is

1. In a thermostat, the combination, with the case and the insulating-barF, of the metallic strips thereon and having an opening for the post, the casting O, secured to the case by fusible solder, the post I, secured at its lower end to the casting and provided at its upper end with a disk normally above the metallic strips, and electrical connections, substantially as shown and described.

2. In a thermostat, the combination, with the case and the casting l, secured therein by fusible solder, of theinsulating-bar F, the metallic strips upon said bar and having apertures, as shown, the contact-screws in said openings, the rubber plugs in the casting, the post I, passed through an opening in the insulating-bar and secured to the casting and carrying a disk at its upper end normally out of contact with the bar, the arms attached to the plugs and bearing on the screws, and a wire connecting the lower ends of the arms, substantially as specified.

3. The combination, with the plate A, having depending flanges A and central screw A the body portion B, secured at its upper edge to said flange, an insulating-bar extending transversely across the interior of the body portion and provided upon'its upper face with metallic strips G and G having apertures for the reception of screws H and H and a central opening for the passage of a post, the casting O, secured to the body portion by fusible solder, the post I, secured at its lower end to the casting and at its upper end being extended through the central openings and provided with a disk, the arms E and E attached to but insulated from the casting and connecting the same with the screws II and I1 and a Wire connecting the lower ends of the arms, substantially as described, and for the purpose specified.

In testimony whereof I ailix my signature in presence of two witnesses.

IVILLIAM F. SINGER.

\Vitncsses:

B. II. LAUeKs, FRANKLIN I'I. llonen. 

